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https://issues.apache.org/jira/browse/KAFKA-14056?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17942106#comment-17942106
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Luke Chen commented on KAFKA-14056:
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Changing the target version to 3.9.2. We can always add to v3.9.2 if necessary.
> Test reading of old messages formats in ZK-to-KRaft upgrade test
> ----------------------------------------------------------------
>
> Key: KAFKA-14056
> URL: https://issues.apache.org/jira/browse/KAFKA-14056
> Project: Kafka
> Issue Type: Task
> Components: kraft
> Affects Versions: 3.9.0
> Reporter: Ron Dagostino
> Priority: Blocker
> Fix For: 3.9.2
>
>
> Whenever we support ZK-to-KRaft upgrade we must confirm that we can still
> read messages with an older message format. We can no longer write such
> messages as of IBP 3.0 (which is the minimum supported with KRaft), but we
> must still support reading such messages with KRaft. Therefore, the only way
> to test this would be to write the messages with a non-KRaft cluster, upgrade
> to KRaft, and then confirm we can read those messages.
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